One section of Light Island is made up of several slits to mimic the light waves we don't usually see. We can place a concave filter in front of these slits to see how it affects the light.

1. What do you think will happen to the bands of light?
2. Will the effect of the filter change if you turn the filter around?

Make your guess first (no cheating!), then play the movies below to find out if you are right! (You can also find the answers at the bottom of the page.)

Forwards . . .

. . . or backwards

Try another filter

Back to Light Island

Back to Light! Spectra! Action!

Answers:
1. Concave filters cause the bands of light to converge (come together).
2. No, it doesn't matter which way you put the filter. Light rays still converge.

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